*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
.clearfloat{
    clear: both;
}
#logo{
    width: 100%;
    height:200px;
    background-color: black;
}
#menu{
    width: 100%;
    height:100px;
    background-color: gray;
}
#content{
    width: 100%;
    
    background-color: rgb(246, 244, 131);
}
#footer{
    width: 100%;
    height:100px;
    background-color: rgb(131, 244, 131);
}
#left{
    width:20%;
   
    background-color: brown;
    float: left;
}
#mid{
    width: 50%;
    
    background-color: azure;
    float: left;
}
#right{
    width: 30%;
    
    background-color: aquamarine;
    float: left;
}